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A Cd(II) Luminescent Coordination Grid as a Multiresponsive Fluorescence Sensor for Cr(VI) Oxyanions and Cr(III), Fe(III), and Al(III) in Aqueous Medium
| Content Provider | MDPI |
|---|---|
| Author | Liao, Kuo-Shun Tsai, Meng-Jung Hsu, Li-Jen Wang, Chih-Min Wu, Jing-Yun |
| Copyright Year | 2021 |
| Description | Hydro(solvo)thermal reactions of $Cd(NO_{3})_{2}$, N-(pyridin-3-ylmethyl)-4-(pyridin-4-yl)-1,8-naphthalimide (NI-mbpy-34), and 5-bromobenzene-1,3-dicarboxylic acid $(Br-1,3-H_{2}$bdc) afforded a luminescent coordination polymer, ${[Cd(Br-1,3-bdc)(NI-mbpy-34)(H_{2}O)]∙2H_{2}O}_{n}$ (1). Single-crystal X-ray diffraction analysis showed that 1 features a two-dimensional (2-D) gridlike sql layer with the point symbol of $(4^{4}·6^{2}$), where the Cd(II) center adopts a ${CdO_{5}N_{2}$} pentagonal bipyramidal geometry. Thermogravimetric (TG) analysis confirmed the thermal stability of 1 up to about 340 °C, whereas XRPD patterns proved the maintenance of crystallinity and framework integrity of 1 in $CH_{2}Cl_{2}$, $H_{2}$O, $CH_{3}$OH, and toluene. Photoluminescence studies indicated that 1 displayed intense blue fluorescence emissions in both solid-state and $H_{2}$O suspension-phase. Owing to the good fluorescent properties, 1 could serve as an excellent turn-off fluorescence sensor for selective and sensitive Cr(VI) detection in water, with LOD = 15.15 μM for CrO_{4}$^{2}$− and 14.91 μM for Cr_{2}O_{7}$^{2}$−, through energy competition absorption mechanism. In addition, 1 could also sensitively detect $Cr^{3+}$, $Fe^{3+}$, and $Al^{3+}$ ions in aqueous medium via fluorescence-enhancement responses, with LOD = 2.81 μM for $Cr^{3+}$, 3.82 μM for $Fe^{3+}$, and 3.37 μM for $Al^{3+}$, mainly through an absorbance-caused enhancement (ACE) mechanism. |
| Starting Page | 7103 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules26237103 |
| Journal | Molecules |
| Issue Number | 23 |
| Volume Number | 26 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-11-24 |
| Access Restriction | Open |
| Subject Keyword | Molecules Inorganic Chemistry Coordination Polymer Cr(vi) Oxyanion Luminescence Sensor Trivalent Metal Ion |
| Content Type | Text |
| Resource Type | Article |
